Add flake-compat.

default.nix

@@ -0,0 +1,10 @@
+(import
+  (
+    let lock = builtins.fromJSON (builtins.readFile ./flake.lock); in
+    fetchTarball {
+      url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+      sha256 = lock.nodes.flake-compat.locked.narHash;
+    }
+  )
+  { src = ./.; }
+).defaultNix

flake.lock

@@ -21,6 +21,22 @@
         "type": "github"
       }
     },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1641205782,
+        "narHash": "sha256-4jY7RCWUoZ9cKD8co0/4tFARpWB+57+r1bLLvXNJliY=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b7547d3eed6f32d06102ead8991ec52ab0a4f1a7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "locked": {
         "lastModified": 1638122382,
@@ -117,6 +133,7 @@
     "root": {
       "inputs": {
         "cargo2nix": "cargo2nix",
+        "flake-compat": "flake-compat",
         "flake-utils": "flake-utils_3",
         "nixpkgs": "nixpkgs_3",
         "rust-overlay": "rust-overlay_2"

flake.nix

@@ -2,9 +2,13 @@
   description = "Project for syncing various home-system configuration files.";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-21.11";
-    flake-utils.url = "github:numtide/flake-utils";
     cargo2nix.url = "github:cargo2nix/cargo2nix/master";
+    flake-compat = {
+      url = github:edolstra/flake-compat;
+      flake = false;
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-21.11";
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs = {
@@ -14,7 +18,7 @@
     };
   };
 
-  outputs = { self, nixpkgs, flake-utils, cargo2nix, rust-overlay }:
+  outputs = { self, cargo2nix, flake-compat, flake-utils, nixpkgs, rust-overlay }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs {